Motors: expansible chamber type – With correlated control of motive fluid and locking means – Sequential operation of locking means and motive fluid control
Patent
1987-08-03
1989-02-07
Garrett, Robert E.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Sequential operation of locking means and motive fluid control
91 45, 91189A, F15B 1526
Patent
active
048024015
ABSTRACT:
A pneumatically movable device with a safety lock means having a movable member, a pneumatic actuator connected to the movable member and adapted to move the movable member and a direction control valve connected to the actuator. A cylinder for locking is connected between one of the ports of the cylinder and the direction control valve. A spring is disposed in the cylinder for locking. Openings provided at a chamber at a side of the spring are connected to the actuator and the directional control valve respectively through a check valve disposed for preventing the air from flowing into the cylinder for locking. Openings provided at a chamber at a side remote from the spring are connected to on one hand to the actuator through a check valve disposed for preventing the air from flowing into the cylinder for locking and on the other hand to the directional valve through the check valve with a restrictor disposed for preventing the air from flowing into the direction control valve. A locking member is attached to the piston rod of the cylinder for locking and an engaging member engageable with the locking member is attached to the movable member.
REFERENCES:
patent: 2582030 (1952-01-01), Halward
patent: 3072074 (1963-01-01), Lunde et al.
patent: 3141382 (1964-07-01), Oldfield et al.
patent: 3270621 (1966-09-01), DeRidder
patent: 3348454 (1967-10-01), Kahn et al.
Garrett Robert E.
Ichikoh Engineering, Ltd.
Williamson Mark A.
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